Granted Patent
Utility
US 4,663,413 · App. 06/688,788
Polysiloxane-polylactone block copolymers
Inventors:
Robert S. Ward, Judy S. Riffle
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Jan 4, 1985
Inventors
Robert S. Ward
Judy S. Riffle
Assignee (at issue)
Thoratec Laboratories Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.